Md Shah, W., M. H. Yaakob, N. Harum, A. Hassan, M. F. I. Othman, and I. R. A. Hamid. “Internet of Things Based Heart Rate Monitoring and Alert System”. Journal of Advanced Computing Technology and Application (JACTA), Vol. 2, no. 1, May 2020, pp. 15-20, https://jacta.utem.edu.my/jacta/article/view/5209.